/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.jf.uhf;

import java.util.Set;


import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;

import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;

/**
 * This Activity appears as a dialog. It lists any paired devices and
 * devices detected in the area after discovery. When a device is chosen
 * by the user, the MAC address of the device is sent back to the parent
 * Activity in the result Intent.
 */
public class DeviceListActivity extends Activity {
    // Debugging
    private static final String TAG = "DeviceListActivity";
    // Return Intent extra
    public static String EXTRA_DEVICE_ADDRESS = "device_address";

    // Member fields
    private BluetoothAdapter mBtAdapter;
    private ArrayAdapter<String> mPairedDevicesArrayAdapter;
    private ArrayAdapter<String> mNewDevicesArrayAdapter;
    private	int mScreenWidth = -1, mScreenHeight = -1;
    
    private ListView pairedListView = null;
    private ListView newDevicesListView = null;
    
    private boolean isDiscoveryFinished = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.device_list);


        setResult(Activity.RESULT_CANCELED);


        Button scanButton = (Button) findViewById(R.id.button_scan);
        
        scanButton.setOnClickListener(new OnClickListener() 
        {
            public void onClick(View v) 
            {
                doDiscovery();
                v.setVisibility(View.GONE);
            }
        });


        mPairedDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);
        mNewDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);


        pairedListView = (ListView) findViewById(R.id.paired_devices);
        pairedListView.setAdapter(mPairedDevicesArrayAdapter);
        pairedListView.setOnItemClickListener(mDeviceClickListener);


        newDevicesListView = (ListView) findViewById(R.id.new_devices);
        newDevicesListView.setAdapter(mNewDevicesArrayAdapter);
        newDevicesListView.setOnItemClickListener(mDeviceClickListener);


        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        
        filter.addAction(BluetoothDevice.ACTION_NAME_CHANGED);        
        filter.addAction(BluetoothDevice.ACTION_CLASS_CHANGED);
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);        
        this.registerReceiver(mReceiver, filter);

        mBtAdapter = BluetoothAdapter.getDefaultAdapter();


        Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices();


        if (pairedDevices.size() > 0) 
        {
            findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);
            for (BluetoothDevice device : pairedDevices) 
            {
            	if (BluetoothAdapter.checkBluetoothAddress(device.getAddress()))
            		mPairedDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
            }
        } 
        else 
        {
            String noDevices = getResources().getText(R.string.none_paired).toString();
            mPairedDevicesArrayAdapter.add(noDevices);
        }
        
        setListViewHeight(pairedListView, 0.3f);//0.3f
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        // Make sure we're not doing discovery anymore
        if (mBtAdapter != null) {
            mBtAdapter.cancelDiscovery();
        }

        if (!isDiscoveryFinished) {
	        try {
	        	// Unregister broadcast listeners
	        	this.unregisterReceiver(mReceiver);
	        } catch (Exception e) {
				;
			}
        }
    }

    /**
     * Start device discover with the BluetoothAdapter
     */
    private void doDiscovery() {

        // Indicate scanning in the title
        setProgressBarIndeterminateVisibility(true);
        setTitle(R.string.scanning);

        // Turn on sub-title for new devices
        findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE);

        // If we're already discovering, stop it
        if (mBtAdapter.isDiscovering()) {
            mBtAdapter.cancelDiscovery();
        }

        // Request discover from BluetoothAdapter
        mBtAdapter.startDiscovery();
    }

    // The on-click listener for all devices in the ListViews
    private OnItemClickListener mDeviceClickListener = new OnItemClickListener() {
        public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) {
            // Cancel discovery because it's costly and we're about to connect
            mBtAdapter.cancelDiscovery();

            // Get the device MAC address, which is the last 17 chars in the View
            String info = ((TextView) v).getText().toString();
            String address = null;
            if(info.length() > 17)
            	address = info.substring(info.length() - 17);
            else
            	finish();

            // Create the result Intent and include the MAC address
            Intent intent = new Intent();
            intent.putExtra(EXTRA_DEVICE_ADDRESS, address);

            // Set result and finish this Activity
            setResult(Activity.RESULT_OK, intent);
            finish();
        }
    };

    // The BroadcastReceiver that listens for discovered devices and
    // changes the title when discovery is finished
    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            // When discovery finds a device
            if (BluetoothDevice.ACTION_FOUND.equals(action) ||
            		BluetoothDevice.ACTION_NAME_CHANGED.equals(action) ||
            		BluetoothDevice.ACTION_CLASS_CHANGED.equals(action)) {
                // Get the BluetoothDevice object from the Intent
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                if (device != null && device.getBondState() == BluetoothDevice.BOND_NONE) {
                	String name = device.getName();
                	if (name != null && mNewDevicesArrayAdapter.getPosition(name + "\n" + device.getAddress()) < 0) {
            				mNewDevicesArrayAdapter.add(name + "\n" + device.getAddress());
                	}
                }
            // When discovery is finished, change the Activity title
            } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
                setProgressBarIndeterminateVisibility(false);
                setTitle(R.string.select_device);
                if (mNewDevicesArrayAdapter.getCount() == 0) {
                    String noDevices = getResources().getText(R.string.none_found).toString();
                    mNewDevicesArrayAdapter.add(noDevices);
                }
        	    unregisterReceiver(this);
        	    isDiscoveryFinished = true;
            }
            
            setListViewHeight(newDevicesListView, 0.8f);
        }
    };
    
	public void setListViewHeight(ListView listView, float scale) 
	{
		ListAdapter listAdapter = listView.getAdapter();
		if (listAdapter == null) 
		{
			return;
		}
		int totalHeight = 0;
		for (int i = 0; i < listAdapter.getCount(); i++) 
		{
			View listItem = listAdapter.getView(i, null, listView);
			listItem.measure(0, 0);
			totalHeight += listItem.getMeasuredHeight();
		}
		/*
		if (totalHeight > 0) 
		{
			ViewGroup.LayoutParams params = listView.getLayoutParams();
			params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
			if (params.height + listView.getTop() > mScreenHeight * scale) 
			{
				params.height = (int) (mScreenHeight * scale) - listView.getTop();
			}
			if (params.height > 0) listView.setLayoutParams(params);
		}
		*/
	}

	public boolean onTouchEvent(MotionEvent event) { 

        switch (event.getAction())
        {
        case MotionEvent.ACTION_UP:
        	if (event.getX() < 0 || event.getY() < 0 ||
            		2 * event.getRawX() - event.getX() > mScreenWidth ||
            		2 * event.getRawY() - event.getY() > mScreenHeight) {
            		this.finish();
            	}
        break;
        }
        return true;
	}
}
